Method for reducing the consumption of fresh water in a...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/66 (2006.01) F28C 1/00 (2006.01) F28C 1/02 (2006.01) F28C 1/14 (2006.01) F28F 25/08 (2006.01)

Patent

CA 2255931

The invention concerns a method for reducing the consumption of fresh water and energy in a paper mill. In the method fresh water is passed into the paper mill for various needs, and a cooling tower (100) is utilized, by whose means the water that has been heated in the papermaking process is cooled. All fresh waters or a substantial proportion of the fresh waters of the paper mill are introduced into the process through the water system of the cooling tower. Further, the invention concerns a cooling tower, in which there is/are an inlet/inlets (10) for passing the water (Win) to be cooled into the cooling tower (100), nozzles (13) or equivalent for dispersing the water that was passed in and that is to be cooled onto heat transfer faces, filler pieces and/or filler plates (15), which disperse the water to be cooled so as to increase the contact area between the water and the cooling air, an outlet/outlets (17) for passing the cooled water (Wout) out of the cooling tower (100), as well as blowers (23) for blowing the cooling air (Ain Aout) through the cooling tower (100). The cooling tower (100) is composed of cooling modules (301...30N), each of which comprises the elements (10...23) mentioned above, and the number (N) and the height of said cooling modules (301...30N) have been chosen in accordance with the requirement of cooling capacity, and that said cooling modules (301...30N) have been interconnected mechanically in parallel and connected selectively and optimally in view of the flow (Ain Aout) of the cooling air and of the flow (Win Wout) of the water to be cooled.

L'invention a trait à une technique visant à réduire la consommation d'une papeterie en eau douce et en énergie. Dans le cadre de cette technique, l'eau douce passe dans la papeterie pour différentes raisons et l'on utilise une tour de refroidissement (100) servant à refroidir l'eau qui s'est réchauffée durant le processus de fabrication du papier. L'ensemble des eaux douces utilisées par la papeterie ou une proportion importante de celles-ci est introduit dans le processus par le biais du circuit d'eau de la tour de refroidissement. Cette invention concerne, de surcroît, une tour de refroidissement comportant un ou plusieurs orifices d'admission (10) permettant l'entrée de l'eau à refroidir (W¿in?) dans la tour (100), des tuyères (13), ou leur équivalent, dispersant l'eau après son entrée, laquelle eau doit être refroidie sur des surfaces de transfert de chaleur, des pièces et/ou des plaques de charge (15) dispersant l'eau à refroidir de manière à augmenter la surface de contact entre l'eau et l'air de refroidissement, un ou plusieurs orifices d'évacuation (17) permettant la sortie de l'eau refroidie (W¿out?) de la tour de refroidissement (100) ainsi que des machines soufflantes (23) destinées à insuffler l'air de refroidissement (A¿in? ? A¿out?) dans la tour (100). Cette dernière se compose de modules de refroidissement (30¿1?...30¿N?), comportant chacun les éléments susmentionnés (10 ... 23), le nombre (N) et la taille de ces modules de refroidissement ayant été choisis en fonction des exigences de la capacité de refroidissement. Les modules sont raccordés en parallèle, par des moyens mécaniques, et de manière sélective et optimale, eu égard au flux (A¿in? ? A¿out?) de l'air de refroidissement et au flux (W¿in? ? W¿out?) de l'eau à refroidir.

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